chore(deps): update grafana/loki docker tag to v3

| datasource | package      | from   | to    |
| ---------- | ------------ | ------ | ----- |
| docker     | grafana/loki | 2.9.15 | 3.5.6 |


Signed-off-by: renovate-sh-app[bot] <219655108+renovate-sh-app[bot]@users.noreply.github.com>

Author: renovate-sh-app[bot]

docker-compose.yaml

@@ -22,7 +22,7 @@ services:
       - ./testdata/prometheus-entrypoint.sh:/etc/prometheus/entrypoint.sh
 
   loki:
-    image: grafana/loki:2.9.15@sha256:2fde6baaa4743a6870acb9ab5f15633de35adced3c0e3d61effd2a5f1008f1c3
+    image: grafana/loki:3.5.6@sha256:2b10e3c0ba66ee115c018736b351c435006c809d32ea2c14be62be88d80f8372
     ports:
       - "3100:3100"
     command: -config.file=/etc/loki/loki-config.yml